/*-
 * ============LICENSE_START=======================================================
 * ONAP POLICY-CLAMP
 * ================================================================================
 * Copyright (C) 2020-2021 AT&T Intellectual Property. All rights
 *                             reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END============================================
 * ===================================================================
 *
 */

import React from 'react'
import Button from 'react-bootstrap/Button';
import Form from 'react-bootstrap/Form';
import Col from 'react-bootstrap/Col';
import Row from 'react-bootstrap/Row';
import Select from 'react-select';
import Modal from 'react-bootstrap/Modal';
import styled from 'styled-components';
import LoopService from '../../../api/LoopService';
import LoopCache from '../../../api/LoopCache';
import { JSONEditor }  from '@json-editor/json-editor/dist/jsoneditor.js';
import "@fortawesome/fontawesome-free/css/all.css"
import Alert from 'react-bootstrap/Alert';
import OnapConstant from '../../../utils/OnapConstants';
import OnapUtils from '../../../utils/OnapUtils';

const ModalStyled = styled(Modal)`
    background-color: transparent;
`

const DivWhiteSpaceStyled = styled.div`
    white-space: pre;
`

export default class PolicyModal extends React.Component {

    state = {
        show: true,
        loopCache: this.props.loopCache,
        jsonEditor: null,
        policyName: this.props.match.params.policyName,
        // This is to indicate whether it's an operational or config policy (in terms of loop instance)
        policyInstanceType: this.props.match.params.policyInstanceType,
        pdpGroup: null,
        pdpGroupList: [],
        pdpSubgroupList: [],
        chosenPdpGroup: '',
        chosenPdpSubgroup: '',
        showSucAlert: false,
        showFailAlert: false
    };

    constructor(props, context) {
        super(props, context);
        this.handleClose = this.handleClose.bind(this);
        this.handleSave = this.handleSave.bind(this);
        this.renderJsonEditor = this.renderJsonEditor.bind(this);
        this.handlePdpGroupChange = this.handlePdpGroupChange.bind(this);
        this.handlePdpSubgroupChange = this.handlePdpSubgroupChange.bind(this);
        this.createJsonEditor = this.createJsonEditor.bind(this);
        this.handleRefresh = this.handleRefresh.bind(this);
        this.disableAlert =  this.disableAlert.bind(this);
        this.renderPdpGroupDropDown = this.renderPdpGroupDropDown.bind(this);
        this.renderOpenLoopMessage = this.renderOpenLoopMessage.bind(this);
        this.renderModalTitle = this.renderModalTitle.bind(this);
        this.readOnly = props.readOnly !== undefined ? props.readOnly : false;
    }

    handleSave() {
        var editorData = this.state.jsonEditor.getValue();
        var errors = this.state.jsonEditor.validate();
        errors = errors.concat(this.customValidation(editorData, this.state.loopCache.getTemplateName()));

        if (errors.length !== 0) {
            console.error("Errors detected during policy data validation ", errors);
            this.setState({
                showFailAlert: true,
                showMessage: 'Errors detected during policy data validation:\n' + OnapUtils.jsonEditorErrorFormatter(errors)
            });
            return;
        }
        else {
            console.info("NO validation errors found in policy data");
            if (this.state.policyInstanceType === OnapConstant.microServiceType) {
                this.state.loopCache.updateMicroServiceProperties(this.state.policyName, editorData);
                this.state.loopCache.updateMicroServicePdpGroup(this.state.policyName, this.state.chosenPdpGroup, this.state.chosenPdpSubgroup);
                LoopService.setMicroServiceProperties(this.state.loopCache.getLoopName(), this.state.loopCache.getMicroServiceForName(this.state.policyName)).then(resp => {
                    this.setState({ show: false });
                    this.props.history.push('/');
                    this.props.loadLoopFunction(this.state.loopCache.getLoopName());
                });
            } else if (this.state.policyInstanceType === OnapConstant.operationalPolicyType) {
                this.state.loopCache.updateOperationalPolicyProperties(this.state.policyName, editorData);
                this.state.loopCache.updateOperationalPolicyPdpGroup(this.state.policyName, this.state.chosenPdpGroup, this.state.chosenPdpSubgroup);
                LoopService.setOperationalPolicyProperties(this.state.loopCache.getLoopName(), this.state.loopCache.getOperationalPolicies()).then(resp => {
                    this.setState({ show: false });
                    this.props.history.push('/');
                    this.props.loadLoopFunction(this.state.loopCache.getLoopName());
                });
            }
        }
    }

    customValidation(editorData, templateName) {
        // method for sub-classes to override with customized validation
        return [];
    }

    handleClose() {
        this.setState({ show: false });
        this.props.history.push('/');
    }

    componentDidMount() {
        this.renderJsonEditor();
    }

    componentDidUpdate() {
        if (this.state.showSucAlert === true || this.state.showFailAlert === true) {
            let modalElement = document.getElementById("policyModal")
            if (modalElement) {
                modalElement.scrollTo(0, 0);
            }
        }
    }

    createJsonEditor(toscaModel, editorData) {
        /*JSONEditor.defaults.themes.myBootstrap4 = JSONEditor.defaults.themes.bootstrap4.extend({
                getTab: function(text,tabId) {
                    var liel = document.createElement('li');
                    liel.classList.add('nav-item');
                    var ael = document.createElement("a");
                    ael.classList.add("nav-link");
                    ael.setAttribute("style",'padding:10px;max-width:160px;');
                    ael.setAttribute("href", "#" + tabId);
                    ael.setAttribute('data-toggle', 'tab');
                    text.setAttribute("style",'word-wrap:break-word;');
                    ael.appendChild(text);
                    liel.appendChild(ael);
                    return liel;
                }
            });*/
        return new JSONEditor(document.getElementById("editor"),
        {   schema: toscaModel,
              startval: editorData,
              theme: 'bootstrap4',
              iconlib: 'fontawesome5',
              object_layout: 'grid',
              disable_properties: false,
              disable_edit_json: false,
              disable_array_reorder: true,
              disable_array_delete_last_row: true,
              disable_array_delete_all_rows: false,
              array_controls_top: true,
              keep_oneof_values: false,
              collapsed:true,
              show_errors: 'always',
              display_required_only: false,
              show_opt_in: false,
              prompt_before_delete: true,
              required_by_default: false
        })
    }

    renderJsonEditor() {
        console.debug("Rendering PolicyModal ", this.state.policyName);
        var toscaModel = {};
        var editorData = {};
        var pdpGroupValues = {};
        var chosenPdpGroupValue, chosenPdpSubgroupValue;
        if (this.state.policyInstanceType === OnapConstant.microServiceType) {
            toscaModel = this.state.loopCache.getMicroServiceJsonRepresentationForName(this.state.policyName);
            editorData = this.state.loopCache.getMicroServicePropertiesForName(this.state.policyName);
            pdpGroupValues = this.state.loopCache.getMicroServiceSupportedPdpGroup(this.state.policyName);
            chosenPdpGroupValue = this.state.loopCache.getMicroServicePdpGroup(this.state.policyName);
            chosenPdpSubgroupValue = this.state.loopCache.getMicroServicePdpSubgroup(this.state.policyName);
        } else if (this.state.policyInstanceType === OnapConstant.operationalPolicyType) {
            toscaModel = this.state.loopCache.getOperationalPolicyJsonRepresentationForName(this.state.policyName);
            editorData = this.state.loopCache.getOperationalPolicyPropertiesForName(this.state.policyName);
            pdpGroupValues = this.state.loopCache.getOperationalPolicySupportedPdpGroup(this.state.policyName);
            chosenPdpGroupValue = this.state.loopCache.getOperationalPolicyPdpGroup(this.state.policyName);
            chosenPdpSubgroupValue = this.state.loopCache.getOperationalPolicyPdpSubgroup(this.state.policyName);
        }

        if (toscaModel == null) {
            return;
        }

        var pdpSubgroupValues = [];
        if (typeof(chosenPdpGroupValue) !== "undefined") {
            var selectedPdpGroup =    pdpGroupValues.filter(entry => (Object.keys(entry)[0] === chosenPdpGroupValue));
            pdpSubgroupValues = selectedPdpGroup[0][chosenPdpGroupValue].map((pdpSubgroup) => { return { label: pdpSubgroup, value: pdpSubgroup } });
        }
        this.setState({
                        jsonEditor: this.createJsonEditor(toscaModel,editorData),
                        pdpGroup: pdpGroupValues,
                        pdpGroupList: pdpGroupValues.map(entry => {
                                                      return { label: Object.keys(entry)[0], value: Object.keys(entry)[0] };
                                              }),
                        pdpSubgroupList: pdpSubgroupValues,
                        chosenPdpGroup: chosenPdpGroupValue,
                        chosenPdpSubgroup: chosenPdpSubgroupValue
                    })
    }

    handlePdpGroupChange(e) {
        var selectedPdpGroup =    this.state.pdpGroup.filter(entry => (Object.keys(entry)[0] === e.value));
        const pdpSubgroupValues = selectedPdpGroup[0][e.value].map((pdpSubgroup) => { return { label: pdpSubgroup, value: pdpSubgroup } });
        if (this.state.chosenPdpGroup !== e.value) {
            this.setState({
                chosenPdpGroup: e.value,
                chosenPdpSubgroup: '',
                pdpSubgroupList: pdpSubgroupValues
            });
        }
    }

    handlePdpSubgroupChange(e) {
        this.setState({ chosenPdpSubgroup: e.value });
    }

    handleRefresh() {
        var newLoopCache, toscaModel, editorData;
        if (this.state.policyInstanceType === OnapConstant.microServiceType) {
            LoopService.refreshMicroServicePolicyJson(this.state.loopCache.getLoopName(),this.state.policyName).then(data => {
                newLoopCache =  new LoopCache(data);
                toscaModel = newLoopCache.getMicroServiceJsonRepresentationForName(this.state.policyName);
                editorData = newLoopCache.getMicroServicePropertiesForName(this.state.policyName);
                document.getElementById("editor").innerHTML = "";
                this.setState({
                    loopCache: newLoopCache,
                    jsonEditor: this.createJsonEditor(toscaModel,editorData),
                    showSucAlert: true,
                    showMessage: "Successfully refreshed"
                });
            })
            .catch(error => {
                console.error("Error while refreshing the Operational Policy Json Representation");
                this.setState({
                    showFailAlert: true,
                    showMessage: "Refreshing of UI failed"
                });
            });
        } else if (this.state.policyInstanceType === OnapConstant.operationalPolicyType) {
            LoopService.refreshOperationalPolicyJson(this.state.loopCache.getLoopName(),this.state.policyName).then(data => {
                var newLoopCache =  new LoopCache(data);
                toscaModel = newLoopCache.getOperationalPolicyJsonRepresentationForName(this.state.policyName);
                editorData = newLoopCache.getOperationalPolicyPropertiesForName(this.state.policyName);
                document.getElementById("editor").innerHTML = "";
                this.setState({
                    loopCache: newLoopCache,
                    jsonEditor: this.createJsonEditor(toscaModel,editorData),
                    showSucAlert: true,
                    showMessage: "Successfully refreshed"
                });
            })
            .catch(error => {
                console.error("Error while refreshing the Operational Policy Json Representation");
                this.setState({
                    showFailAlert: true,
                    showMessage: "Refreshing of UI failed"
                });
            });
        }
    }

    disableAlert() {
        this.setState ({ showSucAlert: false, showFailAlert: false });
    }

    renderPdpGroupDropDown() {
        if(this.state.policyInstanceType !== OnapConstant.operationalPolicyType || !this.state.loopCache.isOpenLoopTemplate()) {
            return (
                <Form.Group as={Row} controlId="formPlaintextEmail">
                    <Form.Label column sm="2">Pdp Group Info</Form.Label>
                    <Col sm="3">
                        <Select value={{ label: this.state.chosenPdpGroup, value: this.state.chosenPdpGroup }} onChange={this.handlePdpGroupChange} options={this.state.pdpGroupList} />
                    </Col>
                    <Col sm="3">
                        <Select value={{ label: this.state.chosenPdpSubgroup, value: this.state.chosenPdpSubgroup }} onChange={this.handlePdpSubgroupChange} options={this.state.pdpSubgroupList} />
                    </Col>
                </Form.Group>
            );
        }
    }

    renderOpenLoopMessage() {
        if(this.state.policyInstanceType === OnapConstant.operationalPolicyType && this.state.loopCache.isOpenLoopTemplate()) {
            return (
                   "Operational Policy cannot be configured as only Open Loop is supported for this Template!"
               );
           }
    }

    renderModalTitle() {
        return (
                <Modal.Title>Edit the policy</Modal.Title>
        );
    }

    renderButton() {
        var allElement = [(<Button variant="secondary" onClick={this.handleClose}>
                                                   Close
                         </Button>)];
        if(this.state.policyInstanceType !== OnapConstant.operationalPolicyType || !this.state.loopCache.isOpenLoopTemplate()) {
             allElement.push((
                <Button variant="primary" disabled={this.readOnly} onClick={this.handleSave}>
                                Save Changes
                </Button>
             ));
             allElement.push((
                <Button variant="primary" disabled={this.readOnly} onClick={this.handleRefresh}>
                                Refresh
                </Button>
             ));
        }
        return allElement;
    }

    render() {
        return (
            <ModalStyled size="xl" backdrop="static" keyboard={false} show={this.state.show} onHide={this.handleClose}>
                <Modal.Header closeButton>
                    {this.renderModalTitle()}
                </Modal.Header>
                                <Alert variant="success" show={this.state.showSucAlert} onClose={this.disableAlert} dismissible>
                                        <DivWhiteSpaceStyled>
                                                {this.state.showMessage}
                                        </DivWhiteSpaceStyled>
                                </Alert>
                                <Alert variant="danger" show={this.state.showFailAlert} onClose={this.disableAlert} dismissible>
                                        <DivWhiteSpaceStyled>
                                                {this.state.showMessage}
                                        </DivWhiteSpaceStyled>
                                </Alert>
                <Modal.Body>
                    {this.renderOpenLoopMessage()}
                    <div id="editor" />
                    {this.renderPdpGroupDropDown()}
                </Modal.Body>
                <Modal.Footer>
                    {this.renderButton()}
                </Modal.Footer>
            </ModalStyled>
        );
    }
}